Allow limiting system resource usage about kanatran HOT 3 CLOSED

You can now set limits using MAX_MEM_PERCENT and MAX_CPU_PERCENT for all KT containers including the runner. It's impossible to estimate how much a container will use once started, so the limit is checked before starting. Ex. if your limit is 8GB/16GB, you would set MAX_MEM_PERCENT=50 and it will only start new containers when usage is below 50%. This means that it could theoretically go above 50% but eh 🤷

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also the controller prioritizes hosts based on the relative usage, so the maximum relative load (memory or cpu) is reported to the server

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Done in 9ef7bd9. you can now use

MAX_CPU=50%
MAX_MEM=4GB

or

MAX_CPU=50%
MAX_MEM=50%

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